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【(x+y)²-(x+y)(x-y)】÷2y其中x=-2011y=2012
人气:476 ℃ 时间:2019-10-24 09:48:32
解答
【(x+y)²-(x+y)(x-y)】÷2y
=[x²+2xy+y²-x²+y²]÷2y
=[2xy+2y²]÷2y
=x+y
=-2011+2012
=1
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